Grauer, M. <https://pure.iiasa.ac.at/view/iiasa/1921.html>  (1983).  Reference Point Optimization — The Nonlinear Case.    In:  Essays and Surveys on Multiple Criteria Decision Making. Eds. Hansen, P., pp. 126-135 Germany: Springer Berlin Heidelberg.  ISBN 978-3-642-46473-7 10.1007/978-3-642-46473-7_11 <https://doi.org/10.1007/978-3-642-46473-7_11>.